My Inquiry
My Account
Texas Instruments TPS61181RTERG4
- Part No.:
- TPS61181RTERG4
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
TPS61181RTERG4.pdf
- Description:
- IC LED DRV RGLTR PWM 25MA 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,836
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TPS61181RTERG4 from Texas Instruments is a highly integrated white LED (WLED) driver IC for notebook and media-form-factor LCD backlight systems. It integrates a 40 V/1.5 A boost regulator, six precision 25 mA current sinks with ≤2.5% matching, true shutdown, and auto-adaptive output voltage regulation. It operates from 5 V to 24 V input and supports up to 10 series WLEDs at 120 mA total current in notebook display applications.
For engineers reviewing the TPS61181RTERG4 datasheet, TPS61181RTERG4 pinout, TPS61181RTERG4 application, or TPS61181RTERG4 equivalent, key selection criteria include its built-in LDO for single-supply operation, 1.0 MHz switching frequency, 400 mV IFB regulation threshold, PWM dimming support from 100 Hz to 1 kHz, and fault-protected external PFET driver capability.
Technical Context
The TPS61181RTERG4 implements current-mode PWM control with fully integrated loop compensation, enabling stable regulation across 5–24 V input and up to 38 V output. Its boost converter automatically adjusts VO to maintain only ~400 mV headroom above the lowest IFB voltage, improving efficiency over fixed-output architectures.
It features dual-protection architecture: pulse-by-pulse overcurrent limiting (1.5 A min) on the internal MOSFET and isolation-FET-based input-output disconnection during short-circuit or overvoltage events. The device uses a dedicated Fault pin to drive an external PFET gate and reports system faults externally.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5 V to 24 V - supports wide battery input including 2-cell Li-ion (8.4 V) and 3-cell (12.6 V) configurations. |
| Switching Frequency | 1.0 MHz - enables compact external components (e.g., 4.7 µH inductor, 4.7 µF output cap) and reduces EMI fundamental frequency. |
| Integrated MOSFET | 40 V / 1.5 A N-channel - eliminates need for external high-voltage switch; rated for ≥38 V VO with OVP at 39 V. |
| Current Sink Channels | 6 × 25 mA - supports up to 10-series WLED strings with ≤2.5% current matching between channels. |
| IFB Regulation Threshold | 400 mV - sets precise current via ISET resistor; lowest IFB pin determines VO regulation point for adaptive output. |
| IC Supply Architecture | Built-in LDO - accepts VBAT directly; outputs regulated 3.15 V (typ) at Cin pin, eliminating external bias supply required by TPS61180. |
| PWM Dimming Range | 100 Hz to 1 kHz - ensures flicker-free operation while maintaining linearity; supports 1000:1 range at 100 Hz, 100:1 at 1 kHz. |
Pinout & Package
TPS61181RTERG4 is housed in a thermally enhanced 16-pin QFN package (3 mm × 3 mm, 0.4 mm pitch) with exposed thermal pad. Pin functions are validated per TI SLVS801E Rev. April 2013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGND | Power ground | Internal connection to MOSFET source; must be low-inductance path to power plane. |
| 2 SW | Switch node | Drain of internal MOSFET; connects to inductor and Schottky diode anode. |
| 3 VBAT | Battery input | Main power input (5–24 V); supplies internal LDO and Fault pull-up; UVLO at 4.5 V. |
| 4 VO | Boost output monitor | Feedback input for adaptive output regulation; connected to WLED string anodes. |
| 5 ISET | Current programming | Sets full-scale current sink value (e.g., 62 kΩ → 20 mA per channel) via 1.229 V reference. |
| 6 Cin | LDO output | 3.15 V (typ) regulated supply for internal circuitry; requires 0.1 µF bypass capacitor. |
| 7–9, 12–14 IFB1–IFB6 | Current sink feedback | Cathode inputs for 6 WLED strings; IC regulates lowest IFB to 400 mV for adaptive VO. |
| 10 GND | Signal ground | Reference for logic and analog circuits; separate from PGND to minimize noise coupling. |
| 11 DCTRL | PWM dimming input | Accepts 100 Hz–1 kHz logic-level PWM signal; duty cycle directly controls WLED on/off timing. |
| 15 EN | Enable control | Logic-high enables LDO and IC; must not be tied to Cin to ensure proper startup sequence. |
| 16 Fault | Fault driver output | Open-drain output driving external PFET gate; pulls low during normal operation, high during fault. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-adaptive boost output | VO dynamically tracks minimum IFB voltage (400 mV), minimizing power loss across current sinks and improving efficiency by up to 5% vs fixed-output designs. |
| True shutdown with PFET control | Fault pin drives external PFET to disconnect battery during shutdown or fault, reducing system leakage to <2 µA. |
| Integrated soft-start | Gradually ramps error amplifier reference to limit inrush current and prevent VO overshoot during startup. |
| WLED open/short protection | Detects open strings (TPS61181/2 removes faulty IFB from regulation loop) and shorted strings (IFB OVP at 17 V) without full shutdown. |
| Low-audio-noise PWM dimming | Minimizes output capacitor AC ripple across full dimming range, suppressing audible ceramic capacitor squeal in thin-profile displays. |
Applications
| Notebook LCD Backlight | UMPC Media Display |
|---|---|
|
Use Scenario: Driving 6–10 white LEDs in series for 13.3″–15.6″ notebook displays with 1000:1 brightness control. IC Role / Device Role / Timing Role: Primary WLED current controller and adaptive boost regulator; manages PWM dimming timing and fault isolation sequencing. Use Value: Enables >90% efficiency at 120 mA load while maintaining <3% current matching and eliminating audible noise during video playback. |
Use Scenario: Powering compact 7″–10″ media tablets requiring ultra-thin mechanical design and low EMI. IC Role / Device Role / Timing Role: Integrated power management IC providing regulated current, adaptive voltage, and system-level fault signaling. Use Value: Reduces BOM count by integrating LDO, compensation, and protection-eliminating 4+ discrete components versus discrete solutions. |
| Industrial Panel Display | Medical Imaging Monitor |
|
Use Scenario: Backlighting ruggedized 10.4″–12.1″ industrial HMI panels operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-reliability WLED driver with thermal shutdown (160°C), UVLO hysteresis (300 mV), and robust short-circuit recovery. Use Value: Ensures continuous operation under voltage transients and thermal stress; maintains luminance stability across temperature extremes. |
Use Scenario: Supporting DICOM-compliant grayscale rendering in diagnostic-grade medical monitors requiring precise luminance uniformity. IC Role / Device Role / Timing Role: Precision current source delivering ≤2.5% inter-channel mismatch across all six sinks for consistent backlight intensity. Use Value: Enables accurate grayscale reproduction by eliminating luminance variation between display zones driven by separate WLED strings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61182RTERG4 | 1.3 MHz switching frequency; identical pinout, LDO, and protection features. | Better EMI profile in noise-sensitive systems; reduced inductor size possible but lower efficiency at light loads. | Select when higher switching frequency is needed to avoid sensitive bands or shrink magnetics; verify thermal performance at full load. |
| TPS61165DRVR | Single-channel 30 mA WLED driver; 2.7–6 V input; no integrated boost or PFET driver. | Targeted at low-voltage portable devices (e.g., handhelds); lacks adaptive VO, multi-string support, and fault isolation. | Use only for simple, low-power, single-string applications where cost and size outweigh performance requirements. |
Compared with TPS61181RTERG4, TPS61182RTERG4 offers higher-frequency operation for tighter EMI control but trades off light-load efficiency, while TPS61165DRVR provides minimal integration for ultra-low-cost single-string use-neither matches the full feature set for notebook-class adaptive backlighting.
Availability
TPS61181RTERG4 is available at Aetrix Electronics and suitable for notebook backlight design, industrial panel display development, and medical imaging monitor production requiring stable component supply and long-term lifecycle support.
Supply support for TPS61181RTERG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in display power solutions.
The TPS6118x family was designed specifically for high-efficiency, low-noise WLED backlighting in space-constrained media devices-emphasizing adaptive voltage control, multi-string precision, and system-level fault resilience.
FAQ
What is the function of the Fault pin on the TPS61181RTERG4?
The Fault pin on the TPS61181RTERG4 is an open-drain output that drives the gate of an external PFET to isolate the battery from the WLED strings during overvoltage, short-circuit, or thermal fault conditions. During normal operation, it pulls low to enable the PFET; during fault, it goes high to turn off the PFET and disconnect input power. This behavior is confirmed in the SLVS801E datasheet Section 8.3.16 and Figure 1 functional block diagram.
Does the TPS61181RTERG4 require an external power supply for its internal circuitry?
No, the TPS61181RTERG4 does not require an external power supply for its internal circuitry. It integrates a linear regulator powered from VBAT, delivering a regulated 3.15 V (typical) output at the Cin pin. This eliminates the need for an external 3.3 V rail required by the TPS61180 variant. A 0.1 µF bypass capacitor is mandatory at Cin for LDO stability, as specified in Section 8.3.6 of the SLVS801E datasheet.
How does the TPS61181RTERG4 achieve adaptive output voltage regulation?
The TPS61181RTERG4 achieves adaptive output voltage regulation by continuously monitoring all six IFB pins and regulating the VO pin to maintain exactly 400 mV on the *lowest* IFB voltage. This ensures minimal voltage headroom across the current sinks, improving efficiency-especially when WLED forward voltages vary due to temperature or aging. The mechanism is explicitly described in Sections 7.3.3 and 10.2.2 of the SLVS801E datasheet.
What is the maximum number of WLEDs the TPS61181RTERG4 can drive in series?
The TPS61181RTERG4 can drive up to 10 white LEDs in series, assuming typical forward voltage of ~3.2 V per LED (32 V total), which remains within its 38 V maximum output voltage rating and 39 V overvoltage protection threshold. The datasheet confirms "Up to 10 WLED in Series" in the Applications section and specifies VO range up to 38 V in Recommended Operating Conditions (Section 6.5).
Can unused IFB pins on the TPS61181RTERG4 be left floating?
Yes, unused IFB pins on the TPS61181RTERG4 may be left floating (open). The device detects zero current on open IFB pins during startup, identifies them as disconnected strings, and excludes them from the VO regulation loop-allowing safe operation with fewer than six WLED strings. This behavior is documented in Section 10.2.5 ("IFB PIN UNUSED") of the SLVS801E datasheet and differs from the TPS61180, which requires 10 kΩ pull-down resistors on unused IFB pins.
TPS61181RTERG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 5V
- Voltage - Supply (Max):
- 24V
- Voltage - Output:
- 38V
- Current - Output / Channel:
- 25mA
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WQFN (3x3)
TPS61181RTERG4 FAQ
1.How can I place an order for TPS61181RTERG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61181RTERG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS61181RTERG4 reliable?
The price and inventory of TPS61181RTERG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61181RTERG4 is usually 5 days.
3.What payment methods are accepted for TPS61181RTERG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61181RTERG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61181RTERG4?
TPS61181RTERG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61181RTERG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS61181RTERG4?
For technical support, including TPS61181RTERG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61181RTERG4 requirements.
6.How does Aetrix verify that TPS61181RTERG4 is sourced from the original manufacturer or authorized distributors?
All TPS61181RTERG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS61181RTERG4 meets industry standards.
7.What is the process for return or replacement of TPS61181RTERG4?
All TPS61181RTERG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS61181RTERG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS61181RTERG4 part is unused and in its original packaging.
Return procedure for TPS61181RTERG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS61181RTERG4 Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
